Applicare la formula: $x\cdot x^n$$=x^{\left(n+1\right)}$, dove $x^nx=\frac{2}{3}\cdot \frac{5}{7}x^2y^3x$, $x^n=x^2$ e $n=2$

Applicare la formula: $a+b$$=a+b$, dove $a=2$, $b=1$ e $a+b=2+1$

Applicare la formula: $\frac{a}{b}\frac{c}{f}$$=\frac{ac}{bf}$, dove $a=2$, $b=3$, $c=5$, $a/b=\frac{2}{3}$, $f=7$, $c/f=\frac{5}{7}$ e $a/bc/f=\frac{2}{3}\cdot \frac{5}{7}x^{3}y^3$

Applicare la formula: $ab$$=ab$, dove $ab=3\cdot 7$, $a=3$ e $b=7$

Applicare la formula: $ab$$=ab$, dove $ab=2\cdot 5$, $a=2$ e $b=5$